linux-kernel - Re: [PATCH 1/3] ARM: dts: exynos: Add interrupt to DMC controller in Exynos5422

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Date:   Tue, 1 Oct 2019 14:38:43 +0200
From:   Lukasz Luba <l.luba@...tner.samsung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, b.zolnierkie@...sung.com,
        kgene@...nel.org, mark.rutland@....com, cw00.choi@...sung.com,
        kyungmin.park@...sung.com, m.szyprowski@...sung.com,
        s.nawrocki@...sung.com, myungjoo.ham@...sung.com,
        robh+dt@...nel.org, willy.mh.wolff.ml@...il.com
Subject: Re: [PATCH 1/3] ARM: dts: exynos: Add interrupt to DMC controller
 in Exynos5422

Hi Krzysztof,

On 9/27/19 10:53 AM, Krzysztof Kozlowski wrote:
> On Wed, Sep 25, 2019 at 06:18:11PM +0200, Lukasz Luba wrote:
>> Add interrupt to Dynamic Memory Controller in Exynos5422 and Odroid
>> XU3-family boards. It will be used instead of devfreq polling mode
>> governor. The interrupt is connected to performance counters private
>> for DMC, which might track utilisation of the memory channels.
>>
>> Signed-off-by: Lukasz Luba <l.luba@...tner.samsung.com>
>> ---
>>   arch/arm/boot/dts/exynos5420.dtsi | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/exynos5420.dtsi b/arch/arm/boot/dts/exynos5420.dtsi
>> index ac49373baae7..72738e620d11 100644
>> --- a/arch/arm/boot/dts/exynos5420.dtsi
>> +++ b/arch/arm/boot/dts/exynos5420.dtsi
>> @@ -240,6 +240,8 @@
>>   		dmc: memory-controller@...20000 {
>>   			compatible = "samsung,exynos5422-dmc";
>>   			reg = <0x10c20000 0x100>, <0x10c30000 0x100>;
>> +			interrupt-parent = <&combiner>;
>> +			interrupts = <16 0>;
> 
> You register DMC for DREX0 and DREX1 but take only DREX0 interrupt. Why
> skipping second?
> 

Right, the second should also be there: <16 1>. The channel 1 has not
been triggered in CPU test cases but might be used by some other
NoC clients.
I will add it in the next version.

Regards,
Lukasz